Improvement in attaching door-knobs to their spindles



ttttiit tzend l @fitte trennen. kann', or BUFFALO, New Yoan.

Letters Patent No.11o,9r7,aa1;ed.ianuary 17,1871.

I lIMPROVEMENT IN ATTACHING DOOR-KNOBS TO THEIR SPINDLES.

TheSchedule referred to in these Letters Patent and making parl; of the same.

through the collet into the latter. This screw, from the jar and rattling to which doors are subjected, cspecially on rail-cars, frequently gets loose aud Works out,'resulting in the detachment ot' the knob. To

prevent this, a sleeve or thimble fitting over the shank and covering thehead ofthe screw or coupling-pin has been' employed, the coupling-pin in such case being inserted through a hole or slot which is given a partial revolution -on the shank to break the coincidence between the hole and screw-head. This device has been found objectionable, for plated or finely-finished knobs. t

My invention consists in the special construction and arrangement ot" a sleeve with the rosette, shank, and hole for the coupling-screw, in such a manner as to permit the rosette to be slid back on the sleeve to expose the-hole for the insertion of the screw, the head of which is then covered by sliding thesleeve overit, a tlange on the vinner end of the sleeve preventing its disconnection from the rosette as the latter' is adjusted and scoured in place.

In the accompanying drawing- Figure I is a vertical section inline of the spindle, showing my improved inode of attachment.

Figure 1I is a plan view representingl the sleeve and `rosette in the position required for inserting the coupling-screw.

Like letters of reference indicate like parts in both of the figures. l T A represents the door;

. B, a lock, secured to the. face thereof; Y

C, the spindle, passing through the door;

D D, the knobs;

E and E', the collets or shanks thereof, which iit on the ends of the spindles,`and are secured by screws c c in the nsual'ma'nner, except that the hole for the` screw in the shank VE is made nearer its end;

F is a rosette of ordinary construction; and

G, my improved sleeve, provided with au inner iange, g, designed for the shank E.

For inserting the screw e, the sleeve and. rosette are slid back in-the positionindicated in Fig. II, which-'- leaves sufficient space between the rosette andthe 'door for the purpose.

The'inner end of thc sleeve, when the shank is revquired to be made unusually short, may have a notch,

t, t'ormed'therein to expose the screw-hole m, as shown in Fig. II.

.The screw being inserted, the rosette is slid in place, fastened to the door, the edge ofthe Hange f of' the rosette engaging with the ange g of the sleeve, y

and bringing the latter in the position shown in Fig. I, in which it entirely covers the head of the couplingscrew.

This construction and arrangement ot' the sleeve Gf and rosette enable a much shorter shank for the knob to be used, as the rigid attachment ot' the sleeve.A to and projection from the rosette will obviously-prefvent the sliding back of the latter for inserting the coupling-screw, unless the shank is made the length of the sleeve longer than is required by my improved arrangement.

H represents the thimble, provided with a flange, lt, and designed for theshank on the lock-side ot' th door.

The shank E being iirst secured to the spindlev by the'screw c', ythe thimble is slipped in place on the shank, and the spindle passed throughthe looklanddoor, when the opposite knob is attached in the manner hcrcinbefore described.

The construct-ion and application of the thimble H, dispense with the useot' an abutting flange on the end ofthe shank E', and being a separate piece from the shank and entirely incasing thev same, it not only eectually conceals the screw-head and retains it in place, but, ou account of the facility with which it can be plated, or be made of iner mctfal, enables the shank to be o'rnamented to a degree, and at a cost not attainable by the other modes of construction.

What I claim as my invention is The sleeve G, when provided with a iiange, g, and arranged so as to operate `with the rosette F, shank E, and screw-hole m, substantially in the manner and for the purposes hereinbefore set forth.

' JAMES N. KARR.

Witnesses:

JAY HYATT, JN0. J. BONNER. 

